When the page did eventually load, the Broadband Speed Test was still completely unavailable.
Quite how you can run a broadband speed test on a site that doesn't even respond is a bit of a mystery to me!
When I finally got the test screen to appear, it featured a speed tester from speedtest.net, and the test results gave me a download speed of 769kbps and an upload speed of 242kbps. I'd run a different speed test a few minutes earlier (the Facebook Broadband Speed Challenge) and recorded a download speed of 4753kbps. When I've run these tests previously on this internet connection it has always been above 4Mbps, so I find the five.tv offering entirely implausible. When I tried to run the test again, it just sat there, with status 'Connecting to lon.speedtest.net'.... no good at all!
Note The Five.TV Broadband Speed campaign is now powered by ThinkBroadband. How fast is your broadband? Run the Test!.
It seems even web developers don't get the basics of how the network is strung together from the browser to the web server and the myriad components in between.
The best thing is to run it 3 times and ignore the 'most different' reading.